Allow funplex to handle requests to root.

[wrw.git] / wrw / util.py

diff --git a/wrw/util.py b/wrw/util.py
index bf78f8e..7209ae4 100644 (file)
--- a/wrw/util.py
+++ b/wrw/util.py
@@ -1,34 +1,75 @@
-import inspect
-from . import req, dispatch, session, form
+import inspect, math
+from . import req, dispatch, session, form, resp, proto
 
 def wsgiwrap(callable):
     def wrapper(env, startreq):
         return dispatch.handleenv(env, startreq, callable)
+    wrapper.__wrapped__ = callable
     return wrapper
 
-def stringwrap(charset):
-    def dec(callable):
-        def wrapper(*args, **kwargs):
-            bk = callable(*args, **kwargs)
-            for string in bk:
-                yield string.encode(charset)
-        return wrapper
-    return dec
-
 def formparams(callable):
+    spec = inspect.getargspec(callable)
     def wrapper(req):
-        data = form.formdata(req)
-        spec = inspect.getargspec(callable)
+        try:
+            data = form.formdata(req)
+        except IOError:
+            raise resp.httperror(400, "Invalid request", "Form data was incomplete")
         args = dict(data.items())
         args["req"] = req
         if not spec.keywords:
             for arg in list(args):
                 if arg not in spec.args:
                     del args[arg]
+        for i in range(len(spec.args) - (len(spec.defaults) if spec.defaults else 0)):
+            if spec.args[i] not in args:
+                raise resp.httperror(400, "Missing parameter", ("The query parameter `", resp.h.code(spec.args[i]), "' is required but not supplied."))
         return callable(**args)
+    wrapper.__wrapped__ = callable
     return wrapper
 
-def persession(data = None):
+class funplex(object):
+    def __init__(self, *funs, **nfuns):
+        self.dir = {}
+        self.dir.update(((self.unwrap(fun).__name__, fun) for fun in funs))
+        self.dir.update(nfuns)
+
+    @staticmethod
+    def unwrap(fun):
+        while hasattr(fun, "__wrapped__"):
+            fun = fun.__wrapped__
+        return fun
+
+    def __call__(self, req):
+        if req.pathinfo == "":
+            if "__root__" in self.dir:
+                return self.dir["__root__"](req)
+            raise resp.redirect(req.uriname + "/")
+        if req.pathinfo[:1] != "/":
+            raise resp.notfound()
+        p = req.pathinfo[1:]
+        if p == "":
+            p = "__index__"
+            bi = 1
+        else:
+            p = p.partition("/")[0]
+            bi = len(p) + 1
+        if p in self.dir:
+            sreq = req.shift(bi)
+            sreq.selfpath = req.pathinfo[1:]
+            return self.dir[p](sreq)
+        raise resp.notfound()
+
+    def add(self, fun):
+        self.dir[self.unwrap(fun).__name__] = fun
+        return fun
+
+    def name(self, name):
+        def dec(fun):
+            self.dir[name] = fun
+            return fun
+        return dec
+
+def persession(data=None):
     def dec(callable):
         def wrapper(req):
             sess = session.get(req)
@@ -40,6 +81,7 @@ def persession(data = None):
                         sess[data] = data()
                     sess[callable] = callable(data)
             return sess[callable].handle(req)
+        wrapper.__wrapped__ = callable
         return wrapper
     return dec
 
@@ -72,11 +114,22 @@ class preiter(object):
 def pregen(callable):
     def wrapper(*args, **kwargs):
         return preiter(callable(*args, **kwargs))
+    wrapper.__wrapped__ = callable
     return wrapper
 
+def stringwrap(charset):
+    def dec(callable):
+        @pregen
+        def wrapper(*args, **kwargs):
+            for string in callable(*args, **kwargs):
+                yield string.encode(charset)
+        wrapper.__wrapped__ = callable
+        return wrapper
+    return dec
+
 class sessiondata(object):
     @classmethod
-    def get(cls, req, create = True):
+    def get(cls, req, create=True):
         sess = cls.sessdb().get(req)
         with sess.lock:
             try:
@@ -217,3 +270,10 @@ class specdirty(sessiondata, metaclass=specclass):
                 ss[i] = specslot.unbound
             else:
                 ss[i] = val
+
+def datecheck(req, mtime):
+    if "If-Modified-Since" in req.ihead:
+        rtime = proto.phttpdate(req.ihead["If-Modified-Since"])
+        if rtime is not None and rtime >= math.floor(mtime):
+            raise resp.unmodified()
+    req.ohead["Last-Modified"] = proto.httpdate(mtime)